Blue Valley Northwest dad fighting cancer, who got an early graduation surprise from son, has died

"Being able to do one performance where it`s just me for him it meant the world to me," his son Gavin said.

“Being able to do one performance where it`s just me for him it meant the world to me,” his son Gavin said.

OVERLAND PARK, Kan. —  A Blue Valley Northwest father fighting cancer has died.

Rob Mullin had been battling a brain tumor ever since his son, Gavin, was 3.

Rob Mullin

Rob Mullin

Last week Blue Valley Northwest held a special recital and graduation ceremony so Rob could see his son get his diploma, more than a year early.

The school arranged for Rob’s 17-year-old son Gavin to perform a special recital with his instructor and a woodwind quartet. His one solo, his dad’s favorite song, “I still haven’t found what I’m looking for.”

“As a parent you always dream of those milestones, of watching your kids graduate and get married and Rob has seen so many milestones, it` just unfortunate it won`t be Gavin`s graduation,” his wife Gail told FOX 4 in a previous interview.

But the moving tribute to his dad didn’t end there.

“Put on your time travelers hats, we are escorting you to May of 2018,” Blue Valley Northwest Assistant Principal Katie Bonnema told a crowd of Mullin supporters.

Rob got to watch his son, Gavin, graduate more than a year early.

Rob got to watch his son, Gavin, graduate more than a year early.

Gavin emerged in his cap and gown and was handed the case to a diploma.

“Join me as we recognize Gavin as the first graduate of the class of 2018,” Bonnema proclaimed.

“It was always one of things I wanted him to see me graduate, so being able to have that happen was really spectacular,” Gavin told FOX 4 after that special ceremony.

“In the midst of all the sad things that happen, there`s always something special to be thankful for, and today is proof of that,” Gail said.

The last few months of Rob’s battle against the disease claimed his ability to speak. But you could tell by the smile on his face during that special ceremony this was one of his proudest moments.

His family says Rob died peacefully Monday night.

The Mullin family previously told FOX 4 that they will continue their fight against cancer even after Rob’s passing. They formed a charity more than a decade ago called “Be Headstrong” to support brain cancer patients and their caregivers in the area.

Watch the special ceremony below: